The quantitation of how much time constitutes short and recent varies by disease and by context, but the core denotation of acute is always qualitatively in contrast with chronic, which denotes long-lasting disease (for example, in acute leukemia and chronic leukemia).
View full size image. Thomas Edison is usually credited with the invention of the light bulb, but the famous American inventor wasn't the only one who contributed to the development of this revolutionary technology.
Edison needed light bulbs for his demonstration projects. And so the first bulbs had carbonized paper filaments. Even the finest paper had an irregular distribution of fibers and varied in thickness. Paper filaments only lasted about 300 hours.